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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e7602018970b903e7d50235aad7711a5119cdc737d49d76c833e695f799eb09' 
  AND token = '/dB8kZ+cyW2fxH+uGCrU74ndygPl/eyqMA51H5AQQKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}